Majestic Pet Martingale Pet Collar 10 to 45 lb Dog 10-inch -16-inch Pink Martingale Collar Can be used with a leash or hand Will tighten when pulled and then rela by when pulling stops, this feature prevents the dog from backing out or escaping from his collar Martingale collars come highly recommended by trainers Dimensions 10-16-inch L by 675-inch W